(9n - 8) should do it.
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82. 9x10=90. 90-8=82.
In the everyday decimal system of writing numbers . . .-- The largest two digits are 8 and 9.-- Their product is 72.-- 10 less than that is 62 .
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 = 362880
9*(N - 2)
It is -8.